How to Resolve Content Security Policy Violations in Android Apps Due to External Script Loading?

Content Security Policy Violations: Addressing Script Loading Issues in Android Apps

Upon deploying an app to devices running Android Lollipop (5.0.0) or later, developers may encounter the error message "Refused to load the script because it violates the following Content Security Policy directive." This error occurs when a script is loaded from a source that is not explicitly allowed in the app's Content Security Policy (CSP).

By default, Cordova apps enforce a restricted CSP that prohibits loading scripts from external origins. To resolve this issue, the CSP must be modified to allow the offending script.

Understanding the CSP Directive

The CSP directive "script-src" specifies where scripts can be loaded from. In this case, it is set to "self," indicating that scripts can only be loaded from the same origin as the page.

Modifying the CSP Directive

To allow loading scripts from a specific origin, specify it in the "script-src" directive. For example, to allow loading scripts from "http://example.com," the CSP directive would be modified as follows:

Example Scenario and Fix

Suppose a Cordova app attempts to load a script from "http://external-script.com." By modifying the CSP directive as shown below, the script will be allowed to load:

Remember that modifying the CSP directive should be done carefully to minimize potential security risks. Only include the necessary allowances to allow functionality without compromising security.

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